US7816797B2 - Method and device for harvesting energy from ocean waves - Google Patents

Method and device for harvesting energy from ocean waves Download PDF

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Publication number
US7816797B2
US7816797B2 US12/603,138 US60313809A US7816797B2 US 7816797 B2 US7816797 B2 US 7816797B2 US 60313809 A US60313809 A US 60313809A US 7816797 B2 US7816797 B2 US 7816797B2
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United States
Prior art keywords
magnetostrictive
magnetostrictive elements
electrically conductive
motion
elements
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Expired - Fee Related
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US12/603,138
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US20100133843A1 (en
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Balakrishnan Nair
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Oscilla Power Inc
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Oscilla Power Inc
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Priority to US12/603,138 priority Critical patent/US7816797B2/en
Application filed by Oscilla Power Inc filed Critical Oscilla Power Inc
Priority to EP10729495.1A priority patent/EP2386023A4/en
Priority to PCT/US2010/020332 priority patent/WO2010080885A1/en
Priority to CA2746463A priority patent/CA2746463A1/en
Priority to AU2010203667A priority patent/AU2010203667B2/en
Priority to NZ593324A priority patent/NZ593324A/en
Priority to JP2011544686A priority patent/JP5567594B2/ja
Assigned to OSCILLA POWER INCORPORATED reassignment OSCILLA POWER INCORPORATED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HIFUNDA LLC
Publication of US20100133843A1 publication Critical patent/US20100133843A1/en
Priority to US12/901,368 priority patent/US20110133463A1/en
Priority to US12/906,895 priority patent/US7964977B2/en
Publication of US7816797B2 publication Critical patent/US7816797B2/en
Application granted granted Critical
Priority to US13/105,759 priority patent/US8378513B2/en
Priority to US13/232,692 priority patent/US20120001427A1/en
Assigned to OSCILLA POWER INC. reassignment OSCILLA POWER INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NAIR, BALAKRISHNAN
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
    • H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
    • F03B13/12—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy
    • F03B13/14—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy
    • F03B13/16—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem"
    • F03B13/18—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" where the other member, i.e. rem is fixed, at least at one point, with respect to the sea bed or shore
    • F03B13/1845—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" where the other member, i.e. rem is fixed, at least at one point, with respect to the sea bed or shore and the wom slides relative to the rem
    • F03B13/1855—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" where the other member, i.e. rem is fixed, at least at one point, with respect to the sea bed or shore and the wom slides relative to the rem where the connection between wom and conversion system takes tension and compression
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N35/00—Magnetostrictive devices
    • H10N35/101—Magnetostrictive devices with mechanical input and electrical output, e.g. generators, sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2280/00—Materials; Properties thereof
    • F05B2280/50—Intrinsic material properties or characteristics
    • F05B2280/5008—Magnetic properties
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/30—Energy from the sea, e.g. using wave energy or salinity gradient

Definitions

  • Embodiments of the invention described herein relate to a method and device for producing electricity by conversion of the mechanical energy of waves such as ocean waves in a water body.
  • Embodiments described herein include a method and device for converting the mechanical energy of oscillating ocean waves into magnetic and electrical energy using a novel design that utilizes magnetostrictive elements.
  • Embodiments of the design combine proven concepts from existing technologies, such as the oscillating buoy concept used in the Pelamis machine with technology proven on the bench scale for energy generation using magnetostrictive devices to create a powerful solution for harvesting energy from ocean waves.
  • Embodiments of the design are expected to have relatively low capital costs and very good survivability during strong storms.
  • Numerical models to be developed are expected to outline specific designs of the device capable of delivering over 1 GW of power and perform bench scale demonstration of the key concept of generating electric power using a modular structure containing magnetostrictive elements.
  • Some embodiments may include power management strategies to optimize the delivered power from a suite of these devices distributed across the ocean surface.
  • Embodiments of the invention relate to methods for generating electricity.
  • the method includes utilizing the motion of a body of water, including wave motion, to cause changes in the strain of one or more magnetostrictive elements.
  • the method also includes using a corresponding change in magnetic field around the magnetostrictive elements to generate an electric voltage and/or electric current in one or more electrically conductive coils or circuits that are in the vicinity of the magnetostrictive elements.
  • the method includes utilizing the motion of a body of water, including wave motion, to cause motion of one or more buoys, which in turn causes changes in the strain of one or more magnetostrictive elements to which one or more buoys may be coupled mechanically.
  • the method also includes using a corresponding change in magnetic field around the magnetostrictive elements to generate an electric voltage and/or electric current in one or more electrically conductive coils or circuits that are in the vicinity of the magnetostrictive elements.
  • Other embodiments of methods for generating electricity are also described.
  • Embodiments of the invention also relate to a device for generating electricity.
  • the device includes at least one magnetostrictive element which, when deployed in a body of water, the motion of the body of water, including wave motion, causes changes in the strain of one or more magnetostrictive elements.
  • the device also includes one or more electrically conductive coils or circuits within the vicinity of one or more of the magnetostrictive elements, wherein a corresponding change in magnetic field around the one or more magnetostrictive elements generates an electric voltage and/or electric current in the one or more electrically conductive coils or circuits.
  • the device in another embodiment, includes a buoy deployed in a body of water.
  • the device also includes a magnetostrictive element mechanically coupled to the buoy, wherein the motion of the body of water, including wave motion, causes motion of the buoy, which in turn causes changes in the strain of the magnetostrictive element.
  • the device also includes an electrically conductive coil or circuit within the vicinity of the magnetostrictive element, wherein a corresponding change in magnetic field around the magnetostrictive element generates an electric voltage and/or electric current in the electrically conductive coil or circuit.
  • Other embodiments of devices for generating electricity are also described.
  • FIG. 1 depicts a schematic block diagram of one embodiment of a device for harvesting energy from the oscillations of ocean waves.
  • FIG. 2 depicts a schematic diagram of one embodiment of the magnetostrictive elements of the energy harvesting device of FIG. 1 .
  • FIG. 3 depicts a graph of calculation results of initial analysis of power generation from ocean waves using one embodiment of a magnetostrictive element subjected to a cycling load employing a partially submerged buoy.
  • FIG. 4 depicts a schematic circuit diagram of one embodiment of an equivalent circuit diagram of several magnetostrictive elements arranges so as to move synchronously as an ocean wavefront moves through.
  • FIG. 5 depicts another schematic block diagram of the energy harvesting device of FIG. 1 .
  • references to an “ocean wave” refer to waves in any stationary, moving, or oscillating body of water, and the use of the word ocean wave in no way limits the scope or applicability of the invention to the ocean environment alone.
  • FIG. 1 depicts a schematic block diagram of one embodiment of a device 100 for harvesting energy from the oscillations of ocean waves 102 .
  • the core modules includes a buoy 104 or buoys attached to one or more magnetostrictive elements 106 , which in turn are anchored to the seafloor or to another fixed surface or body using heavy weights 108 , or by any other method.
  • the magnetostrictive elements are shown attached to the buoys by rigid tethers 110 , other embodiments may use non-rigid tethers. Alternatively, the tethers may be omitted altogether, so that the magnetostrictive elements extend from the anchors to the buoys.
  • buoy in the context of this description refers to any physical body that may float on or near the surface of a body of water when allowed to freely do so with no forces other than its own gravity and the buoyant force applied by the water acting on the body.
  • Magnetostrictive materials have the property that when a strain is imposed on these materials, it results in a change in magnetization (or flux density) of an associated magnetic field.
  • the phenomenon of magnetostriction has been known for over a century, but the field was really revolutionized by the discovery of giant magnetostrictive (Tb,Dy) alloys for use at cryogenic temperatures in the 1960s. Subsequently, giant magnetostrictive materials that work at room temperature including (Tb,Dy) and Terfenol alloys were developed.
  • Magnetostrictive materials show changes in linear dimensions when a magnetic field is applied (Joule magnetostriction) and a reciprocal effect of changes in the magnetic properties with the application of stress. These characteristics make it possible to use magnetostrictive materials to function as both actuators and as sensors. They are analogous to piezoelectric materials, but have a large operating bandwidth extending to low frequencies, higher energy density, and capability for higher power and force delivery. For certain embodiments of this particular application, magnetostrictive materials are superior to piezoelectric materials due to their greater mechanical durability and lower production cost in high volumes.
  • the geometry of the individual magnetostrictive elements may be defined such that, for the appropriate type of buoy, the expected loads generated will result in strains that are below the saturation magnetostriction.
  • the extension of the magnetostrictive element follows a similar oscillation, resulting in a constantly changing magnetic flux density along the length of the magnetostrictive element.
  • FIG. 2 depicts a schematic diagram of one embodiment of the magnetostrictive elements 106 of the energy harvesting device 100 of FIG. 1 .
  • the magnetostrictive element 106 includes a polymer coated copper coil 112 , an external protective polymer sheath 114 , and a magnetostrictive rod 116 .
  • the illustration of the magnetostrictive element and coil, shown in FIG. 2 in no way limits the type, orientation, structure, composition, of either the magnetostrictive element of the coil.
  • the coil may, without limitation, be wound, suspended, printed or otherwise attached or located in the vicinity of the magnetostrictive element.
  • magnetostrictive element simply refers to a buoy or structure, at least a portion of which is constructed of materials possessing magnetostrictive properties.
  • the “vicinity” of the magnetostrictive element refers to any location adjacent to or within the proximity of the magnetostrictive element which allows the coil to sufficiently experience the changing magnetic flux density of the magnetostrictive element so as to result in a measurable potential or current, for example, greater than about 0.01 mV or about 0.01 ⁇ A, respectively. More specifically, the vicinity may be limited to distances at which the coil experiences a measurable change in the magnetic flux density of the magnetostrictive element. Since the strength and profile of the changing magnetic flux density may depend on the configuration of the magnetostrictive element, and the sensitivity of the coil may depend on the construction and placement of the coil, the “vicinity” of the magnetostrictive element may vary from one embodiment to another.
  • the buoy may be of any shape and size, in at least one embodiment the buoys are designed such that their vertical height, or other dimension at normal to the surface of the ocean, exceeds the expected amplitude of oscillations of normal wave motion at a geographic location of interest. In other words, in some embodiments, the buoy is always partially submerged whether it is at the crest of a wave or the trough.
  • the system is also designed such that even as the wave is at a trough, the submerged portion of the buoy is more than what it might have been if the buoy were floating freely—this ensures a tensile load on the magnetostrictive elements through the entire range of motion of the buoy as the wave oscillates, and that the field changes constantly as the wave progresses through its entire amplitude. If at any point the strain reaches a maximum (for example, the buoy is fully submerged), for some period of time following that, until the strain starts to change again, the output voltage will be zero or near zero.
  • the structure of the magnetostrictive elements is shown in more detail in FIG. 2 .
  • a core-rod of magnetostrictive material is wound with polymer (e.g., Teflon, PTFE) coated copper wire to the desired number of turns.
  • polymer e.g., Teflon, PTFE
  • the selection of the polymer is not critical except that the polymer should be rated to provide electrical insulation for the highest rated voltage expected in the coil.
  • the wire diameter may be optimized for the intended application, as there is a trade-off between using an increased wire diameter to lower electrical resistance of the coil that allows the delivery or a greater voltage and higher power (lower IR losses) and using a decreased wire diameter to lower the cost and weight of the coil itself.
  • the external sheath can also be of the same or similar material as the polymer coating. Alternatively, the external sheath may be another material to provide corrosion protection of the magnetostrictive rod.
  • some embodiments may account for specific variations in sea level due to factors such as tides for ensuring that the structure continues to function as an effective power generation source while the external environment varies.
  • the location of the buoy relative to the nominal surface of the ocean is a consideration for the device to function effectively.
  • seasonal and daily tidal variations may be accounted for in the determination of where to locate the buoys.
  • FIG. 5 shows one example of a tether controller 140 to provide such monitoring and control.
  • the “anchor” rather than being a dead-weight may have a pulley system 142 (refer to FIG. 5 ) and load sensors 144 (refer to FIG. 5 ) to release or reel in the magnetostrictive elements as needed.
  • the energy for the tension control system may be supplied by the corresponding magnetostrictive elements and coils. Such energy may be supplied on demand or via a storage device such as a battery 146 (refer to FIG. 5 ).
  • magnetostrictive elements may use other materials.
  • Recent research explored ductile and low field magnetostrictive alloys based on Fe—Ga, Fe—Mo, and Fe—W.
  • these alloys are attractive due to their excellent ductility and high magnetostriction values obtained at low applied magnetic fields that are an order of magnitude smaller than that needed for Terfenol-D alloys.
  • the saturation magnetization is not critical as any magnetostrictive material can be made to work by changing the geometry of the magnetostrictive element for the appropriate expected loading. What may be more critical are factors such as cost and reliability as these factors directly affect the capital and operating costs of energy harvesting device and, therefore, the cost of the delivered energy.
  • the reliability requirement may be divided into a mechanical strength requirement and a corrosion resistance requirement; although the latter may be less critical if appropriate protective jackets, or sheaths, are used.
  • Terfenol-D As a simple comparison of Terfenol-D with alpha-iron-based alloys (Fe—Ga, Fe—Al, Fe—W and Fe—Mo), Terfenol-D is an alloy or iron with terbium and Dysprosium (Tb 0.3 Dy 0.7 Fe 1.9 ). The high alloying levels of the relatively scarce and expensive Tb and Dy makes Terfenol-D very expensive.
  • ⁇ -Fe based alloys are relatively inexpensive and robust, and ⁇ -Fe based alloys provide adequate magnetostrictive behavior for this application, in certain embodiments.
  • FIG. 3 depicts a graph 120 of calculation results of initial analysis of power generation from ocean waves using one embodiment of a magnetostrictive element subjected to a cycling load employing a partially submerged buoy. Preliminary first order calculations to validate the concept have been carried out. The results, illustrated in FIG. 3 , show that for practical geometries it is possible to obtain voltages as high as 200 V. Also, the nature of the voltage wave-form from a single device results in a sinusoidal voltage output.
  • This analysis utilized a very simple model that assumed that a magnetostrictive member, with a cross-section of 2 cm ⁇ 2 cm and length 2 m, is subject to a sinusoidal load varying from ⁇ 490 to ⁇ 1145 N, loads that can be easily generated by partial submersion of a buoy of weight 50 kg and effective density of around 300 kg/m 3 .
  • This initial analysis shows that it is possible to generate an oscillating voltage with an amplitude as high as 100 V using a simple geometry for the magnetostrictive element.
  • the geometries or numbers used in this calculation in no way limit the scope of the present invention and are only intended as an example.
  • FIG. 4 depicts a schematic circuit diagram 130 of one embodiment of an equivalent circuit diagram of several magnetostrictive elements arranges so as to move synchronously as an ocean wavefront moves through.
  • R 1 ⁇ R 2 ⁇ . . . ⁇ R n By controlling the manufacturing process of the magnetostrictive elements, it is possible to the condition R 1 ⁇ R 2 ⁇ . . . ⁇ R n . If the magnetostrictive elements are arranged so that they all are synchronized to move in unison as the wave front moves along, a high power, high-voltage output can be generated.
  • the movement of the magnetostrictive elements may be synchronized by locating the elements in a pattern that anticipates the expected geometry of the waveforms in a particular geographic area.
  • FIG. 5 depicts another schematic block diagram of the energy harvesting device 100 of FIG. 1 .
  • the illustrated energy harvesting device 100 includes a tether controller 140 with one or more pulleys 142 and/or sensors 144 .
  • the pulleys and sensors are shown as part of the anchors, other embodiments may include pulleys and/or sensors in different parts of the overall configurations, e.g., at the buoys, between the tethers and magnetostrictive elements, and so forth.
  • the illustrated anchors also include batteries 146 , which may store electrical energy generated by one or more of the energy harvesting devices.
  • multiple energy harvesting devices are coupled to a power management system 148 , which combines the electrical energy generated at each of the energy harvesting devices into one or more outputs with higher voltages and/or overall power.
  • the technology described herein is clean and creates electricity from ocean waves without consuming any carbonaceous fuels or generating any harmful pollutants. Even compared with other technologies for harvesting ocean power, the lack of moving parts and joints that require lubrication that may leak and pollute the oceans, this technology is exceptionally clean and environmentally friendly.
  • the substitution of the energy generated by embodiments described may herein reduce green house gases and pollutants, compared with fossil fuels, without any undesirable side-effects or compromises.
  • the technology is friendly to marine life as the structures will not result in any significant impediment to natural migration patterns or affect sea-life in any significant way.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
US12/603,138 2009-01-07 2009-10-21 Method and device for harvesting energy from ocean waves Expired - Fee Related US7816797B2 (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
US12/603,138 US7816797B2 (en) 2009-01-07 2009-10-21 Method and device for harvesting energy from ocean waves
EP10729495.1A EP2386023A4 (en) 2009-01-07 2010-01-07 METHOD AND DEVICE FOR RECOVERING ENERGY FROM OCEAN WAVES
PCT/US2010/020332 WO2010080885A1 (en) 2009-01-07 2010-01-07 Method and device for harvesting energy from ocean waves
CA2746463A CA2746463A1 (en) 2009-01-07 2010-01-07 Method and device for harvesting energy from ocean waves
AU2010203667A AU2010203667B2 (en) 2009-01-07 2010-01-07 Method and device for harvesting energy from ocean waves
NZ593324A NZ593324A (en) 2009-01-07 2010-01-07 Method and device for harvesting energy from ocean waves
JP2011544686A JP5567594B2 (ja) 2009-01-07 2010-01-07 海洋波エネルギー収穫方法及び装置
US12/901,368 US20110133463A1 (en) 2009-01-07 2010-10-08 Method and device for harvesting energy from ocean waves
US12/906,895 US7964977B2 (en) 2009-01-07 2010-10-18 Method and device for harvesting energy from ocean waves
US13/105,759 US8378513B2 (en) 2009-01-07 2011-05-11 Method and device for harvesting energy from ocean waves
US13/232,692 US20120001427A1 (en) 2009-01-07 2011-09-14 Method and device for harvesting energy from ocean waves

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US14307809P 2009-01-07 2009-01-07
US12/603,138 US7816797B2 (en) 2009-01-07 2009-10-21 Method and device for harvesting energy from ocean waves

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US12/901,368 Continuation US20110133463A1 (en) 2009-01-07 2010-10-08 Method and device for harvesting energy from ocean waves
US12/906,895 Continuation US7964977B2 (en) 2009-01-07 2010-10-18 Method and device for harvesting energy from ocean waves

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US20100133843A1 US20100133843A1 (en) 2010-06-03
US7816797B2 true US7816797B2 (en) 2010-10-19

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US12/603,138 Expired - Fee Related US7816797B2 (en) 2009-01-07 2009-10-21 Method and device for harvesting energy from ocean waves
US12/901,368 Abandoned US20110133463A1 (en) 2009-01-07 2010-10-08 Method and device for harvesting energy from ocean waves
US12/906,895 Expired - Fee Related US7964977B2 (en) 2009-01-07 2010-10-18 Method and device for harvesting energy from ocean waves
US13/105,759 Expired - Fee Related US8378513B2 (en) 2009-01-07 2011-05-11 Method and device for harvesting energy from ocean waves
US13/232,692 Abandoned US20120001427A1 (en) 2009-01-07 2011-09-14 Method and device for harvesting energy from ocean waves

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US12/901,368 Abandoned US20110133463A1 (en) 2009-01-07 2010-10-08 Method and device for harvesting energy from ocean waves
US12/906,895 Expired - Fee Related US7964977B2 (en) 2009-01-07 2010-10-18 Method and device for harvesting energy from ocean waves
US13/105,759 Expired - Fee Related US8378513B2 (en) 2009-01-07 2011-05-11 Method and device for harvesting energy from ocean waves
US13/232,692 Abandoned US20120001427A1 (en) 2009-01-07 2011-09-14 Method and device for harvesting energy from ocean waves

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US (5) US7816797B2 (ja)
EP (1) EP2386023A4 (ja)
JP (1) JP5567594B2 (ja)
AU (1) AU2010203667B2 (ja)
CA (1) CA2746463A1 (ja)
NZ (1) NZ593324A (ja)
WO (1) WO2010080885A1 (ja)

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US20110089697A1 (en) * 2009-01-07 2011-04-21 Oscilla Power Inc. Method and device for harvesting energy from ocean waves
US20110215580A1 (en) * 2010-03-10 2011-09-08 Weixing Lu System for converting ocean wave energy to electric power
US20120056432A1 (en) * 2010-02-01 2012-03-08 Oscilla Power Inc. Wave energy harvester with improved performance
US20120118391A1 (en) * 2009-05-27 2012-05-17 Nbt As Apparatus employing pressure transients for transporting fluids
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US8629572B1 (en) 2012-10-29 2014-01-14 Reed E. Phillips Linear faraday induction generator for the generation of electrical power from ocean wave kinetic energy and arrangements thereof
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US20150204303A1 (en) * 2014-01-20 2015-07-23 Korea Advanced Institute Of Science And Technology Hybrid wave-current power system
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US9803442B2 (en) 2010-06-17 2017-10-31 Impact Technology Systems As Method employing pressure transients in hydrocarbon recovery operations
US9863225B2 (en) 2011-12-19 2018-01-09 Impact Technology Systems As Method and system for impact pressure generation
US10011910B2 (en) 2012-10-29 2018-07-03 Energystics, Ltd. Linear faraday induction generator for the generation of electrical power from ocean wave kinetic energy and arrangements thereof
US10047717B1 (en) 2018-02-05 2018-08-14 Energystics, Ltd. Linear faraday induction generator for the generation of electrical power from ocean wave kinetic energy and arrangements thereof
US20190145373A1 (en) * 2016-04-24 2019-05-16 The Regents Of The University Of California Submerged wave energy converter for shallow and deep water operations
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US20110133463A1 (en) 2011-06-09
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US20100133843A1 (en) 2010-06-03
US20120119494A1 (en) 2012-05-17
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